import React, { Component, lazy, Suspense } from "react";
import { Route, } from "react-router-dom";
import MyNavLink from "./components/MyNavLink";
import Loading from "./components/Loading"

const Home = lazy(() => import('./components/Home'))
const About = lazy(() => import('./components/About'))
export default class App extends Component {
  render() {
    return (
      <div>
        <div className="row">
          <div className="col-xs-offset-2 col-xs-8">
            <div className="page-header">
              <h2>React Router Demo</h2>
            </div>
          </div>
        </div>
        <div className="row">
          <div className="col-xs-2 col-xs-offset-2">
            <div className="list-group">
              {/* 导航 */}
              <MyNavLink to="/about">About</MyNavLink>
              <MyNavLink to="/home">Home</MyNavLink>
            </div>
          </div>
          <div className="col-xs-6">
            <div className="panel">
              <div className="panel-body">
                {/* 注册路由 */}
                <Suspense fallback={<Loading />}>
                  <Route path="/about" component={About} />
                  <Route path="/home" component={Home} />
                </Suspense>

              </div>
            </div>
          </div>
        </div>
      </div>
    );
  }
}
